Geove



(No Model.)

T. J. & T. G. LOVEGROVE.

. STEAM BOILER. f0. 245,642. Patented Aug. 16,1881.

N. PETERS. Phohz-Lllhogmpher. Washmgmn. D. c.

NITED STATES PATENT OFFICE.

THOMAS J. LOVEGROVE AND THOMAS G. LOVEGROVE, OF PHILADELPHIA,

PENNSYLVANIA.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 245,642, dated August16, 1881.

Application filed June 3, 1881.

To all whom it may concern Be it known that we, THOMAS J. LOVE- GROVEand THOMAS G. LOVEGROVE, both of the city and county of Philadelphia,and State of Pennsylvania, have invented a new and useful Improvement inSteam Boilers, of which the following is a specification, referencebeing had to the accompanying drawings, of Which Figure l is anelevation of a boiler constructed according to our improvement. Fig. 2is a medial longitudinal section thereof, and

- Fig. 3 is a transverse section thereof.

Our invention has special reference to an improved construction of domesof boilers and mode of attaching the same to the boilers.

The object of a dome is to allow the steam to ascend to the eXitpipe ata comparatively low velocity, so that the steam may be disengaged fromthe water in the boiler, a portion of which might otherwise be carriedup into the pipe. Now, in a boiler havinga contracted opening into thedome, not only is the latter comparatively useless for thepurposeiutended, but is actually disadvantageous, for the reason thatthe steam becoming somewhat rarefled after passing up through theopeninginto the wider dome a greater loss from condensation occurs thanwould be the case were the said opening not thus contracted.

It is also well known that numerous explosions have been traced directlyto a weakness resulting from the usual method of attaching the domes toboilers. Because of this vicious method the steam -pressu re permissiblefor safety must be largely reduced-in some instances as much as fiftyper cent. It (such usual method) consists in making a flange upon thedome and riveting the latter to the boiler through the flange. This, inorder to secure strength, and so a higher degree of safety underpressure, necessitates the riveting to be made at a considerabledistance from the edge of the opening which connects the boiler with thedome, and thus said open- (No model.)

ing is contracted-that is, considerably less in diameter than theinterior of the dome'itself, and the usefulness of the latter is therebyimpaired in proportion.

The object of our invention is at one and the 0 increased strength wemake the said flanged 6o sheet of relatively increased thickness ofmetal, as seen in Figs. 2 and 3.

In order to permit the ready escape of steam from the upper part of theboiler into the dome we pierce that part of the latter extend.-

ing below the top of the boiler with a number of small holes, H, as seenin Figs. 2 and 3.

It is obvious that such a connection of the dome with the boiler, asabove described, gives much greater strength to the boiler as a wholethan as in the old Way, and that the opening into the dome, instead ofbeing contracted, as mentioned, is equal in diameter to that of theinterior of the latter.

Having thus described our invention, we

claim as new and wish to secure by Letters Patent- 1. A steam -boilerhaving a flangeless dome extending partially into the boiler below thedome-sheet thereof, the said dome being riv- 8o eted to the flange ofthe dome-sheet, substantially as and for the purposes specified.

2. In combination with dome 1), extending below the dome-sheet A, theopenings H, as and for the purpose specified.

THOMAS J. LOVEGROVE. THOMAS G. LOVEGROVE. Witnesses:

O. H. BROWN, WM. F. HABIOHT.

